Man Page has_facet.3

                       Standard C++ Library
             Copyright 1998, Rogue Wave Software, Inc.

NAME

     has_facet

      - A function template used to determine if a locale  has  a
     given facet.

SYNOPSIS

     #include <locale>
     template  <class  Facet>   bool   has_facet(const   locale&)
     throw();

DESCRIPTION

     has_facet returns true if the requested facet  is  available
     in the locale. Otherwise it returns false.   You specify the
     facet type by explicitly including  the  template  parameter
     (see the example below).

     Note that if your compiler  cannot  overload  function  tem-
     plates   on   return   type,   then   you  need  to  use  an
     alternative_has_facet  template.  The  alternative  template
     takes an additional argument that's a pointer to the type of
     facet you want to check on. The declaration looks like this:


     template <class Facet>
     const bool has_facet(const locale&, Facet*) throw();

     The example below  shows  the  use  of  both  variations  of
     has_facet.

EXAMPLE

     //
     // hasfacet.cpp
     //

     #include <iostream>

     int main ()
     {
      using namespace std;

      locale loc;

     #ifndef _RWSTD_NO_TEMPLATE_ON_RETURN_TYPE
      cout << has_facet<ctype<char> >(loc) << endl;
     #else
      cout << has_facet(loc,(ctype<char>*)0) << endl;
     #endif

      return 0;
     }

SEE ALSO

     locale, facets, use_facet